"Because killing is a threat to the species' sustainability and progression, therefor destructive."
Threat to species, sustainability and progression are value judgments some with plus sign some with minus as in constructive/destructive or more traditionally good/evil.

What I don't get what makes destructive with a minus sign? Killing for food for example does not threaten the species sustainability and progression, Completely the opposite. The more cows we kill the more cows there are and the progress in feed tech and veterinary care keeps it sustainable.

You seem to have an agenda to advance humanity and call it constructive which is with plus sign. But why? Some argue humanity with it's greed and progress is the problem for sustainability of the planet. But it's still confusing. What makes unsustainable with a minus sign?
(I am trying hard to avoid agenda malleable good/evil issues )